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package org.zwobble.mammoth.docx;
import org.zwobble.mammoth.documents.Document;
import org.zwobble.mammoth.documents.Notes;
import org.zwobble.mammoth.results.Result;
import org.zwobble.mammoth.util.MammothLists;
import org.zwobble.mammoth.xml.XmlElement;
import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
import java.net.URISyntaxException;
import java.nio.file.Path;
import java.util.Optional;
import static org.zwobble.mammoth.util.MammothLists.list;
public class DocumentReader {
@FunctionalInterface
private interface BodyReaders {
BodyXmlReader forName(String name);
}
public static Result<Document> readDocument(Optional<Path> path, DocxFile zipFile) {
Styles styles = readStyles(zipFile);
Numbering numbering = readNumbering(zipFile);
ContentTypes contentTypes = readContentTypes(zipFile);
FileReader fileReader = uri -> {
try {
Optional<URI> absoluteUri = asAbsoluteUri(uri);
if (absoluteUri.isPresent()) {
return open(absoluteUri.get());
} else if (path.isPresent()) {
return open(path.get().toUri().resolve(uri));
} else {
throw new IOException("path of document is unknown, but is required for relative URI");
}
} catch (IOException exception) {
throw new IOException("could not open external image '" + uri + "': " + exception.getMessage());
}
};
BodyReaders bodyReaders = name -> {
Relationships relationships = readRelationships(zipFile, name);
return new BodyXmlReader(styles, numbering, relationships, contentTypes, zipFile, fileReader);
};
return readNotes(zipFile, bodyReaders)
.flatMap(notes -> {
DocumentXmlReader reader = new DocumentXmlReader(bodyReaders.forName("document"), notes);
return reader.readElement(parseOfficeXml(zipFile, "word/document.xml"));
});
}
private static InputStream open(URI uri) throws IOException {
return uri.toURL().openStream();
}
private static Optional<URI> asAbsoluteUri(String uriString) {
try {
URI uri = new URI(uriString);
return uri.isAbsolute() ? Optional.of(uri) : Optional.empty();
} catch (URISyntaxException exception) {
return Optional.empty();
}
}
private static Result<Notes> readNotes(DocxFile file, BodyReaders bodyReaders) {
return Result.map(
tryParseOfficeXml(file, "word/footnotes.xml")
.map(NotesXmlReader.footnote(bodyReaders.forName("footnotes"))::readElement)
.orElse(Result.success(list())),
tryParseOfficeXml(file, "word/endnotes.xml")
.map(NotesXmlReader.endnote(bodyReaders.forName("endnotes"))::readElement)
.orElse(Result.success(list())),
MammothLists::concat).map(Notes::new);
}
private static Styles readStyles(DocxFile file) {
return tryParseOfficeXml(file, "word/styles.xml")
.map(StylesXml::readStylesXmlElement)
.orElse(Styles.EMPTY);
}
private static Numbering readNumbering(DocxFile file) {
return tryParseOfficeXml(file, "word/numbering.xml")
.map(NumberingXml::readNumberingXmlElement)
.orElse(Numbering.EMPTY);
}
private static ContentTypes readContentTypes(DocxFile file) {
return tryParseOfficeXml(file, "[Content_Types].xml")
.map(ContentTypesXml::readContentTypesXmlElement)
.orElse(ContentTypes.DEFAULT);
}
private static Relationships readRelationships(DocxFile zipFile, String name) {
return tryParseOfficeXml(zipFile, "word/_rels/" + name + ".xml.rels")
.map(RelationshipsXml::readRelationshipsXmlElement)
.orElse(Relationships.EMPTY);
}
private static Optional<XmlElement> tryParseOfficeXml(DocxFile zipFile, String name) {
try {
return zipFile.tryGetInputStream(name).map(OfficeXml::parseXml);
} catch (IOException exception) {
// TODO: wrap in more specific exception and catch at the top
throw new RuntimeException(exception);
}
}
private static XmlElement parseOfficeXml(DocxFile zipFile, String name) {
return tryParseOfficeXml(zipFile, name)
// TODO: wrap in more specific exception and catch at the top
.orElseThrow(() -> new RuntimeException(new IOException("Missing entry in file: " + name)));
}
}
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